Ajax built category page loses modal image link

[Valdez360]

Joomla! and Virtuemart are 2.5.17 and 2.0.26d respectively.

Site http://oxfordgenetics.com with a product finder on the home page. When the page first loads and a checkbox is selected and the product list is built using Ajax, the image links fail to bring up the modal window unless the page is refreshed when they all work (you have to take my word for this).

When the product finder is set to load list by http request rather than Ajax (as is currently the case), the image modal windows work and open dandy.

I know that this is nothing that Virtuemart is doing wrong. I just wondered if anyone had any ideas?